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[目的]了解杭州市公共场所集中空调冷却水和冷凝水中军团菌污染情况。[方法]2013—2014年7、8月,随机采集杭州市30家公共场所集中空调冷却水、冷凝水各30份。根据WS 394—2012《公共场所集中空调通风系统卫生规范》附录A检测军团菌,并对集中空调使用及管理情况进行调查。[结果]冷却水和冷凝水水样中军团菌检出率分别为33.33%(10/30)和13.33%(4/30),14份阳性样本均为嗜肺军团菌。集中空调使用年限越长,军团菌检出率越高(Z=1.794,P=0.036)。进行清洗消毒后冷却水军团菌检出率为26.09%(6/23),低于未进行者(100.00%,7/7)(P=0.001)。[结论]杭州市公共场所集中空调系统军团菌污染较严重,分布较广。
[Objective] To understand the contamination of Legionella in cooling water and condensate of centralized air-conditioners in public places in Hangzhou. [Method] From July 2013 to July 2014, 30 randomly selected central air conditioning cooling water and 30 condensing water were collected from 30 public places in Hangzhou. Legionella is tested according to Appendix A of WS 394-2012 Hygienic Practice for Central Air Conditioning Ventilation System in Public Places and the investigation of use and management of centralized air conditioners is conducted. [Result] The detection rates of Legionella in cooling water and condensate water were 33.33% (10/30) and 13.33% (4/30), respectively. All 14 positive samples were Legionella pneumophila. The longer the use of central air conditioning, the higher the detection rate of Legionella (Z = 1.794, P = 0.036). The detection rate of Legionella pneumophila in water was 26.09% (6/23) after cleaning and disinfection, which was lower than that of non-people (100.00%, 7/7) (P = 0.001). [Conclusion] Legionella in central air-conditioning system in public places in Hangzhou were more polluted and distributed more widely.